RC Exam - Elec 07

A toroid: uses iron for the core around with the coil is wound. All of the choices. has no magnetic poles. is an electromagnet.

All of the choices.

The internal resistance of a battery: can be measured indirectly by determining how much the output voltage drops for a given load current. can be measured with an ohmmeter. Both cannot be measured with an ohmmeter and can be measured indirectly by determining how much the output voltage drops for a given load current. cannot be measured with an ohmmeter.

Both cannot be measured with an ohmmeter and can be measured indirectly by determining how much the output voltage drops for a given load current.

At the same frequency, a larger capacitance provides. more charge and discharge current. less capacitive reactance, Xc. Both more charge and discharge current and less capacitive reactance, Xc. less charge and discharge current.

Both more charge and discharge current and less capacitive reactance, Xc.

What is occurring when two or more sources of data attempt to use the same bus? Direct memory access PPI Bus contention Bus interruption

Bus contention

Which is not part of the execution unit (EU)? General registers Flags Arithmetic logic unit (ALU) Clock

Clock

Which of the following is not a jump instruction? JA (jump above) JMP (unconditional jump) JB (jump back) JO (jump if overflow)

JB (jump back)

The polarity of an induced voltage is determined by Lenz`s law. the amount of current in the coil motor action. the number of turns in the coil.

Lenz`s law.

Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic, and ferromagnetic), which are used to make permanent magnets? Only paramagnetic and ferromagnetic Only diamagnetic Only ferromagnetic Only paramagnetic

Only ferromagnetic

Which of the following is not an arithmetic instruction? ROL (rotate left) CMP (compare) DEC (decrement) INC (increment)

ROL (rotate left)

The purpose of Milliken's oil drop experiment was to determine: the charge of an electron the sign of the charge on an electron the mass of an electron the ratio of charge to mass of an electron

The digit with the most weight.

Degaussing is done with: alternating current. static electricity. strong permanent magnets. direct current.

alternating current.

The ________ is an electromagnetic device that contains a coil rotating on a jeweled bearing mount. single-pole, double-throw relay d`Arsonval movement crankshaft position sensor permanent-magnet speaker

d`Arsonval movement

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will _______. increase be excessive remain constant decrease

decrease

If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density: remains the same increases decreases doubles

decreases

The inductive reactance, X_L, of an inductor is

directly proportional to frequency.

DMA is particularly suited for data transfer between the ________. disk drive and ROM disk drive and CPU disk drive and I/O disk drive and RAM

disk drive and RAM

A 2200-μF capacitor with a voltage rating of 35 Vis most likely a/an: paper capacitor. mica capacitor. air-variable capacitor. electrolytic capacitor.

electrolytic capacitor.

For a coil, the dc resistance R and inductance L are: infinite. the same thing. in parallel. in series.

in series.

If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage: reverses polarity increases remains unchanged decreases

increases

If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage: is zero increases will remain constant decreases

is zero

The geographic North Pole of the earth has south magnetic polarity no magnetic polarity. None of the choices north magnetic polarity

south magnetic polarity

With interrupt-driven I/O, if two or more devices request service at the same time, ________. the device closest to the CPU gets priority the device that is fastest gets priority the device assigned the highest priority is serviced first the system is likely to crash

the device assigned the highest priority is serviced first

An electron traveling north enters a region where the electric field is uniform and points west. The electron: speeds up veers west slows down veers east

veers east

The induced voltage across a stationary conductor in a stationary magnetic field is ____. increased reversed in polarity decreased zero

zero